where did you get the term "sonic collage" btw? to me at least the term isn't in common usage for any form of noise music. the only time I think I've come across anything similar has been in descriptions of some of my own recent music where I've been collaging various sections of songs together, and those weren't even very noisy! just interested like...

I'd also be interested to know what examples of noisy stuff you've come across and listened to, and if any have made more sense to you than others.